If you have ever placed a market order expecting one price and watched it fill at another, you have experienced slippage. It is one of the most common and least understood costs in trading, and it affects everyone from day traders in fast-moving stocks to long-term investors placing large orders.
This guide explains what is slippage in trading, why it happens, the different types you will encounter, and practical steps you can take to reduce its impact on your trading results.
What Is Slippage in Trading?
Slippage is the difference between the price you expect to pay or receive when you place a trade and the price at which the order actually executes. It occurs across nearly every tradable market, including stocks, forex, futures, options, and cryptocurrencies.
For example, if you place a market order to buy a stock at $50.00 and the order fills at $50.06, you experienced $0.06 of slippage per share. This gap happens because the market price can move in the fraction of a second between when you submit an order and when it reaches the exchange or broker for execution.
Slippage is generally not a sign of broker misconduct. In most cases, it results from normal market mechanics, specifically the relationship between order execution speed, available liquidity, and price volatility.
How to Calculate Slippage
Slippage is calculated by finding the difference between the expected (requested) price and the actual (executed) price of a trade. It can be expressed either as a raw price difference or as a percentage.
Formula:
Slippage = Executed Price − Expected Price
Slippage % = (Executed Price − Expected Price) ÷ Expected Price × 100
| Metric | Value |
|---|---|
| Expected price | $100.00 |
| Executed price | $100.30 |
| Slippage (amount) | $0.30 |
| Slippage (percentage) | 0.30% |
In this example, the trade filled $0.30 above the expected entry price, which equals 0.30% negative slippage on a buy order. The same formula applies whether the result is positive or negative. A negative result on a buy order (executed price lower than expected) or a positive result on a sell order (executed price higher than expected) both represent favorable, or positive, slippage. For orders involving multiple contracts or shares, multiply the per-unit slippage by the total position size to find the total dollar impact.
Positive vs. Negative Slippage
Slippage can work in your favor or against you, depending on how the price moves during execution.
Negative Slippage
Negative slippage occurs when your order fills at a worse price than expected. If you are buying, this means paying more than intended. If you are selling, it means receiving less. Negative slippage is the type most traders associate with the term, since it directly increases trading costs.
Positive Slippage
Positive slippage happens when your order fills at a better price than requested. A buy order might execute below your expected price, or a sell order might fill above it. Positive slippage is less commonly discussed but occurs with roughly similar frequency to negative slippage in efficient, liquid markets, since price movement between order placement and execution is essentially random in direction.
What Causes Slippage?
Several market conditions contribute to slippage. Understanding these causes helps explain why it happens and when it is most likely to occur.
1. Market Volatility
When prices move quickly, the gap between the quoted price and the executed price widens. This is especially common around economic data releases, earnings announcements, central bank decisions, and unexpected news events, where prices can shift meaningfully within seconds.
2. Low Liquidity
Liquidity refers to how easily an asset can be bought or sold without significantly affecting its price. When there are fewer buyers and sellers active in a market, an order may need to be filled across multiple price levels to find enough counter-orders, resulting in an average execution price different from the one quoted. Thinly traded stocks, exotic currency pairs, and smaller cryptocurrencies are more prone to this than highly liquid assets like major indices or large-cap stocks.
3. Order Size
Large orders relative to available market depth can experience more slippage because they may consume multiple layers of the order book. A small order might fill entirely at the best available price, while a large order could partially fill at increasingly less favorable prices until the full size is executed.
4. Execution Speed and Order Routing
The time between submitting an order and its execution, sometimes called latency, matters. Delays caused by slow internet connections, broker infrastructure, or order routing through multiple venues can increase the likelihood of slippage, particularly in fast-moving markets.
5. Order Type Used
Market orders prioritize speed of execution over price certainty, which makes them more susceptible to slippage. Limit orders specify an exact price or better, which can prevent slippage but carries the risk that the order may not execute at all if the market moves away from the limit price.
6. Market Gaps
Gaps occur when an asset’s price jumps from one level to another with little or no trading in between, often between a market’s close and the next open, or following major overnight news. Stop-loss and other pending orders placed near a gap may fill significantly away from the intended price once trading resumes.
Slippage Across Different Markets
Slippage behaves somewhat differently depending on the asset class and trading venue. The examples below illustrate how it can appear in practice.
Stock Example
A trader places a market order to buy 500 shares of a small-cap stock quoted at $20.00. Because the stock has limited daily volume, the order fills in stages: 200 shares at $20.00, 200 shares at $20.05, and 100 shares at $20.12. The average execution price comes out to roughly $20.04, meaning the trader experienced about $0.04 per share of negative slippage, or $20 total on the position.
Forex Example
A trader places a market order to buy EUR/USD at a quoted price of 1.0850 just before a major U.S. employment data release. Due to the sudden spike in volatility, the order fills at 1.0857, seven pips above the requested price. On a standard 100,000-unit lot, that seven-pip difference equals roughly $70 in negative slippage.
Crypto Example
A trader submits a market order to buy a lower-cap altcoin priced at $2.00 on an exchange with thin order book depth. Because there is not enough sell-side liquidity at $2.00 to fill the entire order, portions fill progressively higher, and the average execution price ends up at $2.06, a 3% slippage on the position. Higher-cap coins like Bitcoin or Ethereum typically show much smaller slippage percentages under normal conditions due to deeper liquidity.
Futures Example
A trader places a market order to sell a crude oil futures contract quoted at $78.50 during a period of low open interest overnight. The order executes at $78.35, a $0.15 per barrel difference, which translates to $150 of negative slippage on a standard 1,000-barrel contract.
Typical Slippage by Market
| Market | Typical Slippage Level | Primary Driver |
|---|---|---|
| Major stock indices / large-cap stocks | Low | High liquidity, tight spreads |
| Forex (major pairs) | Low to Medium | News events, session overlaps |
| Futures (major contracts) | Low to Medium | Open interest, session timing |
| Cryptocurrency (large-cap) | Medium | 24/7 trading, exchange fragmentation |
| Small-cap / penny stocks | High | Low volume, wide spreads |
| Cryptocurrency (low-cap altcoins) | Very High | Thin order books, low liquidity |
These figures are general tendencies rather than fixed values. Actual slippage on any trade depends on real-time liquidity, order size, and market conditions at the moment of execution.
Is Slippage the Same as a Broker’s Spread or Commission?
No. The bid-ask spread is the built-in difference between the price at which you can buy and sell an asset at any given moment, and a commission is a fee charged by the broker for executing the trade. Slippage is separate from both. It is the additional price movement that occurs specifically between order placement and order execution, and it can happen regardless of the spread or commission structure a broker uses.
| Slippage | Spread |
|---|---|
| Occurs after an order is placed, during execution | Exists before an order is placed, as a quoted cost |
| Driven by price movement and available liquidity | Set primarily by market makers or liquidity providers |
| Can be positive, negative, or zero | Generally not favorable to the trader; it is a built-in cost |
| Varies unpredictably trade to trade | Typically more stable and quoted in advance |
How to Avoid or Minimize Slippage
While slippage cannot be eliminated entirely in most markets, there are several strategies traders commonly use to reduce its impact.
Use Limit Orders Instead of Market Orders
A limit order lets you set the maximum price you are willing to pay or the minimum price you are willing to accept. This generally prevents negative slippage, though it introduces the risk that the order may not fill if the market does not reach your specified price.
Trade During High-Liquidity Hours
Placing trades when trading volume is highest, such as during major market overlap hours in forex or regular trading hours for stocks, can reduce the likelihood of significant slippage since more buyers and sellers are typically active.
Avoid Trading Around Major News Events
Scheduled announcements like central bank rate decisions, employment reports, and earnings releases often cause sharp, fast price movements. Waiting until volatility settles after these events can reduce exposure to slippage.
Break Up Large Orders
Splitting a large order into smaller portions, sometimes done automatically through algorithmic execution strategies, can help minimize the price impact of consuming multiple levels of the order book at once.
Choose a Broker With Strong Execution Quality
Execution speed and order routing practices vary between brokers. Brokers with direct market access, competitive liquidity partnerships, and low latency infrastructure are generally better positioned to minimize slippage for their clients.
Use Guaranteed Stop-Loss Orders Where Available
Some brokers offer guaranteed stops, which ensure an order closes at the exact price specified regardless of market gaps or volatility. These typically come with an additional fee or wider spread but can be useful for managing risk in highly volatile conditions.
Monitor Market Depth
Checking the order book or level 2 data before placing a trade can give a clearer picture of available liquidity at different price levels, helping you gauge how much slippage a given order size might realistically incur.
Does Slippage Only Hurt Traders?
Not necessarily. Since slippage can be positive or negative, it does not always work against a trader. In highly liquid, well-regulated markets, positive and negative slippage tend to occur with similar frequency over time, meaning their effects can roughly offset each other for active traders. The larger concern for most traders is the variability slippage introduces, since it makes exact entry and exit prices harder to predict, particularly for strategies that depend on precise execution.
Frequently Asked Questions
Is slippage illegal or a sign of a scam broker?
No. Slippage is a normal market phenomenon caused by price movement and liquidity conditions, not broker manipulation. Regulated brokers are generally required to provide fair and reasonable execution, though slippage itself is not something any broker can fully prevent.
Does slippage happen with limit orders?
Limit orders are designed to prevent negative slippage by only executing at your specified price or better. However, they carry execution risk, meaning the order may not fill at all if the market does not reach that price.
Which markets have the most slippage?
Markets or assets with lower trading volume and wider bid-ask spreads, such as small-cap stocks, exotic currency pairs, and lower-liquidity cryptocurrencies, generally experience more slippage than highly liquid, widely traded assets.
Can slippage be completely avoided?
In practice, slippage cannot be fully eliminated in markets that use market orders, since prices can always move during the brief window between order placement and execution. It can, however, be managed and reduced through order type selection, timing, and broker choice.
Final Thoughts
If you understand what is slippage in trading, you’ll be better prepared to manage one of the most common realities of financial markets. Although it can’t be eliminated completely, using the right order types and trading during liquid market conditions can significantly reduce its impact.
